92 
The Ohio Naturalist. 
[Vol. X, No. 5, 
90 feet above Coal No. 3 another coal, another limestone, and 
another ore bed are found. ****** Where the interval between 
the limestones is considerable, two and sometimes three coal 
seams are found between them.” (Ohio Geol. Sur. Vol. II, 
p. 139.] 
The writer questions the interval of 20 feet between the Lower 
or Blue Limestone (which is probably the Lower Mercer) and 
the Putnam Hill. There are other limestones between these two 
which Newberry so far has not reckoned with and it seems 
quite probable that where an interval of much less than 90 feet 
^occurs another stratum is met. 
In his report on Stark County [Ohio Geol. Sur. Vol. Ill, pp. 
151-176] Newberry nowhere mentions the presence of more 
than two limestones below the Lower Kittanning Coal. He 
regularly regards the upper one of the two given as the Putnam 
Hill, and the lower one, the Lower or Blue Limestone. There is 
evidently mistaken identification as will appear later in the 
detail study to follow. 
One county remains to be considered which will complete a 
belt of territory extending from Muskingum County, Ohio, to 
southwestern Mercer County, Pennsylvania, in which belt the 
lower group of limestones occurs. The last link is Mahoning 
County. In his report on this county Newberry notes the pres- 
ence of four limestones below the Lower Kittanning Coal as 
indicated in the ‘‘Section at Lowell” [Ohio Geol. Sur. Vol. Ill, 
opposite p. 804.] Near Youngstown three limestones are indi- 
cated as present [Ohio Geol. Sur. Vol. Ill, p. 803], The upper one of 
these is certainly a new stratum and notin the ‘‘ Section at Lowell” 
as will be shown later. On Indian Creek in Canfield Township 
he notes the presence of two limestones and designates the asso- 
ciated coals as ‘‘No. 3 and 3a,” which would indicate that he 
regarded the lower limestone as the Lower or Blue Limestone. 
This identification will be considered later. 
In his report on Coshocton County, Read notes a limestone 
between the “Blue” or ‘‘Zoar,” and the “Gray” or ‘‘Putnam 
Hill,” and near the former. [Ohio Geol. Sur. Vol. Ill, p. 567.] 
Andrews appears to have observed another limestone near the 
Zoar or Lower Mercer in northern Muskingum County. He also 
notes a thin limestone above the Putnam Hill at Zanesville. 
[Ohio Geol. Sur. Vol. Ill, p. 823.] Orton also notes a limestone 
30 to 40 feet above the Zoar in Vinton and Hocking counties, 
which he names the ‘‘Gore Limestone” in 1878, apparently from 
a village in north-eastern Hocking County. [Ohio Geol. Sur. 
Vol. Ill, p. 898.] Thus in 1878 a limestone occuring between the 
Lower Mercer and the Putnam Hill was recognized in rather 
widely separated places. 
